#include <REGX52.H>
#include "Delay.h"

// 获取按下按键的键码

unsigned char Key() {
	
	unsigned char KeyNumber = 0;
	if (P3_1 == 0){Delay(20); while(P3_1 == 0); Delay(20); KeyNumber = 1;}
	if (P3_0 == 0){Delay(20); while(P3_0 == 0); Delay(20); KeyNumber = 2;}
	if (P3_2 == 0){Delay(20); while(P3_2 == 0); Delay(20); KeyNumber = 3;}
	if (P3_3 == 0){Delay(20); while(P3_3 == 0); Delay(20); KeyNumber = 4;}
	
	return KeyNumber;
	
}